which is better glutathione or kojic acid

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Name: which is better glutathione or kojic acid vs Dark spots, uneven tone, and dull patches can be Top Kojic Acid Soap Brands
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Magnes Res 23:S207-215

GHK-Cu also stimulates both collagen synthesis and matrix metalloproteinases that break collagen down, so unbalanced or excessive use could in principle disrupt extracellular-matrix homeostasis

Ribeiro ASF, Zerolo BE, Lpez-Espuela F, Snchez R, Fernandes VS

One more note: if you're pregnant, high doses of Vitamin A can be a concern, so a lot of people skip topical retinoids (including Retinyl Palmitate) during pregnancy just to be safe

PLoS One , 8: e65240, 2013